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neodymium magnets

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SM 25x275 [2xM8] / N42 - magnetic separator

magnetic separator

Catalog no 130294

GTIN: 5906301812876

5

Diameter Ø [±0,1 mm]

25 mm

Height [±0,1 mm]

275 mm

Weight

0.01 g

762.60 with VAT / pcs + price for transport

620.00 ZŁ net + 23% VAT / pcs

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SM 25x275 [2xM8] / N42 - magnetic separator
Specification/characteristics SM 25x275 [2xM8] / N42 - magnetic separator
properties
values
Cat. no.
130294
GTIN
5906301812876
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
25 mm [±0,1 mm]
Height
275 mm [±0,1 mm]
Weight
0.01 g [±0,1 mm]
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material N42

properties
values
units
remenance Br [Min. - Max.] ?
12.9-13.2
kGs
remenance Br [Min. - Max.] ?
1290-1320
T
coercivity bHc ?
10.8-12.0
kOe
coercivity bHc ?
860-955
kA/m
actual internal force iHc
≥ 12
kOe
actual internal force iHc
≥ 955
kA/m
energy density [Min. - Max.] ?
40-42
BH max MGOe
energy density [Min. - Max.] ?
318-334
BH max KJ/m
max. temperature ?
≤ 80
°C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

properties
values
units
Vickers hardness
≥550
Hv
Density
≥7.4
g/cm3
Curie Temperature TC
312 - 380
°C
Curie Temperature TF
593 - 716
°F
Specific resistance
150
μΩ⋅Cm
Bending strength
250
Mpa
Compressive strength
1000~1100
Mpa
Thermal expansion parallel (∥) to orientation (M)
(3-4) x 106
°C-1
Thermal expansion perpendicular (⊥) to orientation (M)
-(1-3) x 10-6
°C-1
Young's modulus
1.7 x 104
kg/mm²

Shopping tips

It is the "heart" of every magnetic filter used in industry for cleaning raw materials. Its task is separation (separation) of metal filings from the transported material. Thanks to the use of strong neodymium magnets, the rod catches even metallic dust.
The rod consists of a cover tube made of high-quality acid-resistant steel (AISI 304 or 316). Inside there is a stack of strong neodymium magnets arranged in a special configuration (magnetic circuit). Thanks to this, the rod is durable, hygienic, and easy to keep clean.
Metal filings stick to the surface very strongly, so cleaning requires strength or cleverness. You can use compressed air or special non-magnetic strippers (rings). In industry, cover tubes (so-called Easy Clean system) are used, from which the magnetic insert slides out.
The more Gauss, the smaller and more weakly magnetic particles will be effectively caught. The economical version (8kGs) handles large pieces of metal perfectly. High Power versions (~12000-14000 Gs) are necessary for catching metallic dust, oxides, and stainless steel after processing.
We fulfill individual orders for bars perfectly matched to your machine or separator. The rod end is strictly adapted to the fastening system in your device. We ensure fast realization of special orders and technical advice.

Advantages and disadvantages of neodymium magnets.

Besides their stability, neodymium magnets are valued for these benefits:

  • They have constant strength, and over more than ten years their attraction force decreases symbolically – ~1% (in testing),
  • They possess excellent resistance to weakening of magnetic properties due to external magnetic sources,
  • Thanks to the smooth finish, the surface of nickel, gold-plated, or silver gives an elegant appearance,
  • The surface of neodymium magnets generates a strong magnetic field – this is a distinguishing feature,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures approaching 230°C and above...
  • In view of the ability of free molding and customization to specialized needs, NdFeB magnets can be produced in a broad palette of forms and dimensions, which increases their versatility,
  • Fundamental importance in modern technologies – they are commonly used in hard drives, motor assemblies, medical devices, also multitasking production systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Disadvantages of neodymium magnets:

  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Due to limitations in creating threads and complicated shapes in magnets, we recommend using cover - magnetic mount.
  • Health risk related to microscopic parts of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these magnets can be problematic in diagnostics medical in case of swallowing.
  • Due to complex production process, their price is relatively high,

Maximum lifting force for a neodymium magnet – what it depends on?

The specified lifting capacity represents the peak performance, recorded under optimal environment, specifically:

  • on a block made of mild steel, effectively closing the magnetic flux
  • whose transverse dimension reaches at least 10 mm
  • characterized by even structure
  • under conditions of gap-free contact (surface-to-surface)
  • under axial application of breakaway force (90-degree angle)
  • at conditions approx. 20°C

What influences lifting capacity in practice

During everyday use, the actual holding force is determined by a number of factors, ranked from crucial:

  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Direction of force – highest force is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Steel thickness – too thin sheet does not close the flux, causing part of the flux to be escaped into the air.
  • Plate material – mild steel gives the best results. Alloy steels lower magnetic permeability and holding force.
  • Plate texture – smooth surfaces guarantee perfect abutment, which improves force. Uneven metal weaken the grip.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

* Lifting capacity was determined with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the holding force is lower. Moreover, even a small distance {between} the magnet’s surface and the plate decreases the load capacity.

Safe handling of neodymium magnets

Magnets are brittle

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.

Permanent damage

Watch the temperature. Exposing the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and pulling force.

GPS and phone interference

A powerful magnetic field negatively affects the functioning of compasses in smartphones and navigation systems. Keep magnets close to a device to prevent damaging the sensors.

Serious injuries

Big blocks can crush fingers in a fraction of a second. Do not place your hand betwixt two attracting surfaces.

Cards and drives

Powerful magnetic fields can destroy records on credit cards, hard drives, and storage devices. Keep a distance of min. 10 cm.

Warning for heart patients

Medical warning: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.

Powerful field

Before starting, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Be predictive.

No play value

Absolutely store magnets out of reach of children. Ingestion danger is high, and the effects of magnets connecting inside the body are life-threatening.

Skin irritation risks

It is widely known that nickel (standard magnet coating) is a common allergen. If your skin reacts to metals, refrain from direct skin contact or choose versions in plastic housing.

Mechanical processing

Combustion risk: Neodymium dust is explosive. Do not process magnets without safety gear as this risks ignition.

Caution!

Looking for details? Check our post: Are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98